Suddenly . . .

The sneaky-snake flat belly-crawled:
round and through, up and over;
invisible, unseen - yet sly.
We dreamy-dums back sleepy-snored:
in and out, on and on;
oblivious, content - yet blind.
What's this? Surprise!
Two fang marks felt.
Exclamations! Revelations!
The death-blow dealt.
That sneaky-snake flat belly-crawls:
over and under, within and without;
dangerous, silent - yet here.